Showing papers in "Nuclear Engineering and Design in 2001"

TL;DR: In this article, the authors summarized various aspects of the prediction of concrete creep and shrinkage to be discussed in the conference lecture, including theories of physical mechanism, prediction models, constitutive equations, computational approaches, probabilistic aspects, and research directions.

TL;DR: In this article, the authors consider the importance of scale effect that makes it difficult to attempt any extrapolation of the available experimental results in two directions (to the long-term and to large thickness).

TL;DR: In this paper, the authors review the state-of-the-art in the prediction of multidimensional multiphase flow and heat transfer phenomena using a four field, two-fluid model.

TL;DR: The results conclusively demonstrate that the neural network systems are appropriate classifiers of vertical flow regimes and the theoretical models and experimental databases used in the simulation are shown to be reliable.

TL;DR: In this article, a flow-regime transition criteria for vertical upward flows in narrow rectangular channels have been developed considering the mechanisms of flowregime transitions, which can be applied over wide ranges of parameters as well as to boiling flow.

TL;DR: In this article, the authors describe two KROTOS tests in which ∼4 kg of corium melt was injected into a ∼1-m deep subcooled water pool and showed that the corium jet penetrated deep into the water while maintaining its shape.

TL;DR: In this article, the authors presented the results of their initial investigation of a light water reactors (LWR) fuel consisting of mixed thorium dioxide and uranium dioxide (ThO2-UO2).

TL;DR: The first two corium melt quenching tests in subcooled water performed in the FAT FCI vessel of the FARO facility are described in this article, which involved 39 and 92 kg of 80 wt% UO 2 + 20 wt % ZrO 2 melt, respectively.

TL;DR: In this article, the critically refracted longitudinal (LCR) wave data was used to predict the existence of surface compressive stress in a 19mm (0.75in) thick cold-rolled steel plate.

TL;DR: Erve et al. as mentioned in this paper used finite element simulation to verify and validate the welding process on austenitic pipe welds and to make selective statements on improvements to the weld process, which can provide a starting point for a fracture mechanics safety analysis with acceptable computing times.

TL;DR: In this article, the RELAP5-3D computer code was modified to make the explicit coupling capability in the code fully functional, and a test of the modified code, a coupled RELAP-5/RELAP5 analysis of the Edwards-O'Brien blowdown problem was performed.

TL;DR: In this paper, a 256-channel array system has been developed for the inspection of weldment of BWR internal components such as core shrouds and the TOFD crack sizing technique also can be applied using this system.

TL;DR: In this article, the authors present the results of the VERCORS 6 test with high burn-up fuel (60 GWd tU −1 ) and the on-going VERCors HT-RT program, designed to reach fuel liquefaction temperatures.

TL;DR: In this article, the authors used Urbain's correlation developed for ternary SiO2-Al2O3-CaO mixtures to estimate the viscosity of the liquid phase by considering the evolution of its composition during the solid phase deposit.

TL;DR: In this paper, the authors examine and demonstrate the intrinsic differences of the kinetic and dynamic behavior of accelerator driven systems to typical plant transient initiators in comparison to the known, kinetic and dynamical behavior of critical thermal and fast reactor systems.

TL;DR: In this paper, a micro four-sensor conductivity probe is presented, which is capable of acquiring the time-averaged local two-phase flow parameters of various types of bubbles.

TL;DR: In this article, limit and shakedown analysis are formulated as optimization problems for finite element discretizations of structures and the problems of large-scale analysis and the extension towards realistic material modelling are solved in a European research project.

TL;DR: In this paper, the authors look at the various phases and phenomena present during the blowdown event and identify those that are important to thermal stratification, and the scaling necessary to model them in reduced size tests.

TL;DR: In this article, the authors measured void fraction distribution, interfacial area concentration distribution, Sauter mean diameter, and interfacial velocity in subcooled flow boiling, and found that only three researchers have made local measurements in the sub-cooled boiling region.

TL;DR: In this paper, the authors compared the results of the first two experiments, QUENCH-01 (with preoxidation of 300 μm oxide layer thickness at the cladding outside surface) and QUEN CH-02 (reference test without pre-oxidation), are compared in the comparison.

TL;DR: In this article, the authors investigated the response of structures supported on the sliding systems under near-fault earthquake ground motion, where the superstructure is considered to be rigid and the frictional forces mobilized at the interface of the sliding system are assumed to be velocity dependent.

TL;DR: In this paper, the authors investigate the aerosol scrubbing by low-subcooling pools to provide data to help predictive models, and show that important aerosol retention occurs in low sub-cooling pool, and hence the standard assumption of zero decontamination in hot pools is overly conservative.

TL;DR: In this paper, the authors used an electromagnetic flowmeter and an impedance void-meter in an air-water two-phase experimental loop to measure the liquid velocity and the impedance of vertical slug flow.

TL;DR: In this paper, the thermal performance of a chemical heat pump that uses a calcium oxide/carbon dioxide reaction system was discussed as a heat storage system for utilizing heat output from high temperature gas reactors (HTGR).

TL;DR: In this paper, the major findings from the OECD RASPLAV project and the remaining challenges left in the area of in-vessel molten corium coolability are discussed.

TL;DR: In this article, the thermal-hydraulic characteristics during natural circulation in an integral type marine reactor were investigated using scaled test facilities of the Systemintegrated Modular Advanced Reactor (SMART), and the RETRAN-03/INT code was developed.

TL;DR: In this paper, the authors present an application of the non-homogeneous Poisson point process to the study of the rates of occurrence of failures (ROCOF) when they are time dependent, and the times between failures are neither independent nor identically distributed.

TL;DR: In this paper, the authors investigated the rewetting behavior of a hot vertical annular channel, with hot inner tube, for bottom flooding and top flow rewetting conditions, and found that for a given initial surface temperature of the tube, the re-wetting velocity increases with an increase in flow rate of water and it decreases with an increasing in the surface temperature.

TL;DR: In this article, the internal phase distribution of concurrent, air-water bubbly flow in a 50.3mm i.d. transparent horizontal pipeline has been experimentally investigated using the hot-film anemometry technique.